If the trailer is more than 8 or 10 years old, there's a good
possibility that the shock absorber in the tongue of the trailer is
shot.
Tim Mara has posted some great info on his website on how to remove
and replace this part.
http://www.wingsandwheels.com/Tongue%20detail.htm
I believe that Williams should be getting some of those parts in
soon. But if you have not already removed and examined the shock you
must have all the info for your trailer in detail to figure out which
shock you need. Send all the numbers from the left side of the trailer
tongue to Agnes at Cobra. She'll set you straight.
The link Darryl posted is excellent instruction for adjusting the
brakes. Many people adjust the wrong place in the system. You should
never adjust the threaded rod from the tongue to the cable, unless
you're undoing a previous maladjustment.
Jim